MODELLING OF THE MIGRATION OF ~137Cs AND ~60Co RADIONUCLIDES IN THE PRELIMINARY SAFETY ASSESSMENT OF THE NOVI HAN RADIOACTIVE WASTE REPOSITORY. IMPLEMENTATION OF THE EXPERIMENTALLY OBTAINED SORPTION COEFFICIENTS

摘要

Studies on the sorption characteristics of radionuclides in geological media are closely related to the safe disposal of radioactive wastes. That is way in the preliminary safety assessment of the near surface repository for low- and intermediate level radioactive waste in Novi Han are implemented an experimentally obtained sorption coefficients ~137Cs and ~60Co. The radionuclide release rates with respect of the preliminary safety assessment are produced too. The mathematical models implemented in the computer code are used for modeling and calculations of the processes connected with the radionuclide migration for the generated leaching scenarios. The scenarios are chosen on the base of analysis and combination of the possible features, events and processes and waste and engineer barrier states as well as the human behavior component. The implementation of the experimentally obtained sorption coefficients for ~l37Cs and ~60Co is a step to obtain the most realistic for the repository site results. The experiments are produced at the laboratories of the Institute using the soil samples from the repository place. A comparison of the transfer results of the indicated above radionuclides using the data from literature sources and experiments are shown and discussed in the paper.